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<blockquote data-quote="Marguerite" data-source="post: 369328" data-attributes="member: 1991"><p>The really gross thing to tell her - one really important reason that most spider matings end like this, is two-fold. First, the female is about to lay a lot of eggs and this is a tremendous toll on the protein reserves of her body. A handy meal in a no-longer-needed mate comes in very handy and increases the chance of successful offspring.</p><p></p><p>And second - because of the diffuse nerve-net of the nervous system of arachnids and insects, if you cut off the head, the rest of the body moves with more vigour (until the rest of the body starves for lack of nourishment coming in from the intake end). It has been observed tat in species where the female bites the male, the male often actually invites the bite, in order to be more successful in mating. Researchers have measured the number and fitness of offspring from various spider matings and have found that where the male is killed or at least bitten (yes, some survive) then the matings which have vastly greater success are those which take out the male. From a reproductive success point of view, the male that survives to mate again still doesn't produce as many healthy offspring as the male who only gets one go at it.</p><p></p><p>The nerve ganglion in the head actually acts as an inhibitor to movement. Remove the head and the inhibition to extra movement is gone. I remember a lecturer in Invertebrate Zoology describing the diffuse nerve-net of insects and her comment was "when the head has been removed the insect becomes restless and inclined to move about."</p><p></p><p>Marg</p></blockquote><p></p>
[QUOTE="Marguerite, post: 369328, member: 1991"] The really gross thing to tell her - one really important reason that most spider matings end like this, is two-fold. First, the female is about to lay a lot of eggs and this is a tremendous toll on the protein reserves of her body. A handy meal in a no-longer-needed mate comes in very handy and increases the chance of successful offspring. And second - because of the diffuse nerve-net of the nervous system of arachnids and insects, if you cut off the head, the rest of the body moves with more vigour (until the rest of the body starves for lack of nourishment coming in from the intake end). It has been observed tat in species where the female bites the male, the male often actually invites the bite, in order to be more successful in mating. Researchers have measured the number and fitness of offspring from various spider matings and have found that where the male is killed or at least bitten (yes, some survive) then the matings which have vastly greater success are those which take out the male. From a reproductive success point of view, the male that survives to mate again still doesn't produce as many healthy offspring as the male who only gets one go at it. The nerve ganglion in the head actually acts as an inhibitor to movement. Remove the head and the inhibition to extra movement is gone. I remember a lecturer in Invertebrate Zoology describing the diffuse nerve-net of insects and her comment was "when the head has been removed the insect becomes restless and inclined to move about." Marg [/QUOTE]
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